The electromagnetic properties and thermal behavior of Mn-Zn ferrite cores for the blocking filter of PLC application were investigated as the function of additives. The highest density and permeability were 4.98 g/㎤ and 8,221, respectively and were obtained to the specimen with composition of MnO 2...
The electromagnetic properties and thermal behavior of Mn-Zn ferrite cores for the blocking filter of PLC application were investigated as the function of additives. The highest density and permeability were 4.98 g/㎤ and 8,221, respectively and were obtained to the specimen with composition of MnO 24 mol%, ZnO 25 mol% and Fe$_2$O$_3$51 mol%, added MoO$_3$ of 400 ppm, SiO$_2$ of 100 ppm, and CaO of 200 ppm. The uniform grains were organized, and the microstructures were compacted due to reduction of pores in the specimen. The permeability was increased up to 13,904 as the temperature of specimen increased to 110。C. However, it was decreased precipitously under 100 over 110。C. The exothermic behavior was observed in the frequency range from 1 kHz to 1 MHz, and the maximum temperature of specimen was 102。C at 1 MHz. In the consequence, the Mn-Zn ferrite core developed in this research will maintain the stable electromagnetic properties since the temperature of ferrite core rose to 93 。C in the range of 100 kHz to 450 kHz bandwidth qualified for PLC. The blocking filters were designed for single phase and three phases using the in-line and non-contact core. The best attenuation ratios of -46.46 dB and -73.9 dB were measured in the range of 100 kHz to 450 kHz bandwidth, respectively.
The electromagnetic properties and thermal behavior of Mn-Zn ferrite cores for the blocking filter of PLC application were investigated as the function of additives. The highest density and permeability were 4.98 g/㎤ and 8,221, respectively and were obtained to the specimen with composition of MnO 24 mol%, ZnO 25 mol% and Fe$_2$O$_3$51 mol%, added MoO$_3$ of 400 ppm, SiO$_2$ of 100 ppm, and CaO of 200 ppm. The uniform grains were organized, and the microstructures were compacted due to reduction of pores in the specimen. The permeability was increased up to 13,904 as the temperature of specimen increased to 110。C. However, it was decreased precipitously under 100 over 110。C. The exothermic behavior was observed in the frequency range from 1 kHz to 1 MHz, and the maximum temperature of specimen was 102。C at 1 MHz. In the consequence, the Mn-Zn ferrite core developed in this research will maintain the stable electromagnetic properties since the temperature of ferrite core rose to 93 。C in the range of 100 kHz to 450 kHz bandwidth qualified for PLC. The blocking filters were designed for single phase and three phases using the in-line and non-contact core. The best attenuation ratios of -46.46 dB and -73.9 dB were measured in the range of 100 kHz to 450 kHz bandwidth, respectively.
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제안 방법
But this sintering mechanism could be applied to only MoO3 addition and MoO3 rich region in ZnO-MoO3 and CaO-MoO3 system. In this study, the amount of MoO3 addition could not create liquid phase with CaO and ZnO through eutectic reaction, and also, the reaction with ZnOhas been excluded since MoO3 addition was carried out after calcination. Therefore, the reaction in the CaO-MoO3 system forms the second phase such as Ca3MoO6 which exists in the grain boundaries up to sintering temperature and exhibits grain growth [6-8].
It is believed that the attenuation ratio for three phases was better than that of single phase independently on frequency due to higher inductance values resulted from bigger dimension and larger number of Mn- Zn ferrite cores in the blocking filter. The predominant characteristics of attenuation ratio over -40 dB required to blocking filter for power line with the variable loads was attained in both of single and three phases by Mn-Zn ferrite cores developed in this research.
성능/효과
1. The highest density and permeability of 4.98 g/cm3 and 8221 at room temperature were obtained in specimen added MoO3 of 400 ppm, SiO2 of 100 ppm, and CaO 200 ppm because of achievement of uniform microstructures and high density.
후속연구
However, the permeability was decreased precipitously to under 100 over 110 ℃. In the consequence, the ferrite core developed by this research will maintain its stable electromagnetic properties since the temperature of ferrite core rose to 93 ℃ in the range of 100 kHz to 450 kHz for PLC application.
참고문헌 (8)
T. G. W. Stijntjes, Proc. Int. Conf. Ferrites, p. 194, 1970
A. Goldman, 'Modem Ferrite Technology', Kluwer Academic, p.119, 1990
J. M. Blank, 'Equilibrium Atmosphere Schedules for Cooling of Ferrite,' J. Appl. Phys., 32, 376, 1961
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